Python: remove rope_completion language server setting

Rope is not part of the default installation of the python-lsp-server
pypi package and enabling it by default results in an error at startup.

Fixes: QTCREATORBUG-30757
Change-Id: I975ac98d9f4c5b25f5be085461e5b626d3a93fbc
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/python/pythonsettings.cpp

@@ -404,7 +404,6 @@ static const QStringList &plugins()
                                      "pydocstyle",
                                      "pyflakes",
                                      "pylint",
-                                     "rope_completion",
                                      "yapf"};
     return plugins;
 }
@@ -610,7 +609,6 @@ static QString defaultPylsConfiguration()
         plugins.insert("pydocstyle", disabled);
         plugins.insert("pyflakes", enabled);
         plugins.insert("pylint", disabled);
-        plugins.insert("rope_completion", enabled);
         plugins.insert("yapf", enabled);
         QJsonObject pylsp;
         pylsp.insert("plugins", plugins);